Nuclear weak interaction rates in primordial nucleosynthesis

Details Nuclear weak interaction rates in primordial nucleosynthesis Nuclear weak interaction rates in primordial nucleosynthesis

2010-09-01

arxiv.org/abs/1009.0277v1

Phys.Rev.D82:125017,2010

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

10 pages, 6 figures

Scientific paper

10.1103/PhysRevD.82.125017

We calculate the weak interaction rates of selected light nuclei during the epoch of Big Bang Nucleosynthesis (BBN), and we assess the impact of these rates on nuclear abundance flow histories and on final light element abundance yields. We consider electron and electron antineutrino captures on 3He and 7Be, and the reverse processes of positron capture and electron neutrino capture on 3H and 7Li. We also compute the rates of positron and electron neutrino capture on 6He. We calculate beta and positron decay transitions where appropriate. As expected, the final standard BBN abundance yields are little affected by addition of these weak processes, though there can be slight alterations of nuclear flow histories. However, non-standard BBN scenarios, e.g., those involving out of equilibrium particle decay with energetic final state neutrinos, may be affected by these processes.

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